嗒嗒租车系统——main方法

package com.imooc;
import java.util.Scanner;
public class InitDD {

public static void main(String[] args) {
    // TODO Auto-generated method stub
    Car[] carsForRent = {new PassengerCar("奥迪A4",500,4),new PassengerCar("马自达6",400,4),
            new PickUp("皮卡雪6",450,4,2),new PassengerCar("金龙",800,2),new TrunkCar("松花江",400,4),
            new TrunkCar("依维柯",1000,20)};
    System.out.println("欢迎进入嗒嗒租车系统^_^");
    System.out.println("您是否要租车呢?1 是 2 否");
    Scanner sc = new Scanner(System.in);
    String userInput = sc.nextLine();
    if(userInput.equals("1")){
        //用户需要租车
        System.out.println("您可租车的类型及其价目表:");
        System.out.println("序号\t汽车名称\t\t租金\t容量");
        //int i=1;
        for(int i=0;i<carsForRent.length;i++){
            if(carsForRent[i] instanceof PassengerCar){
                System.out.println((i+1)+"\t"+carsForRent[i].getName()+"\t\t"+carsForRent[i].getRentmoney()
                        +"\t载人："+((PassengerCar) carsForRent[i]).getPeopleCapacity()+"人");
            }
            if(carsForRent[i] instanceof PickUp){
                System.out.println((i+1)+"\t"+carsForRent[i].getName()+"\t\t"+carsForRent[i].getRentmoney()
                        +"\t载人："+((PickUp) carsForRent[i]).getPeopleCapacity()+"人 载货"+((PickUp)carsForRent[i]).getCargoCapacity()+"吨");
            }
            if(carsForRent[i] instanceof TrunkCar){
                    System.out.println((i+1)+"\t"+carsForRent[i].getName()+"\t\t"+carsForRent[i].getRentmoney()
                            +"\t载货："+((TrunkCar) carsForRent[i]).getCargoCapacity()+"吨");
            }
        }
        System.out.println("请问您要租几辆车？例如：租车3辆请输入数字3");
        Scanner sc2 = new Scanner(System.in);
        int num = sc2.nextInt();
        float sum = 0f;
        int day = 0;
        int seq =0;//用户租车的序号

        //int[] unitMoney = {};
        //int z = 0;
        for(int j=1;j<=num;j++)
        {
            System.out.println("请输入第"+j+"辆车的序号：");
            Scanner sc3 = new Scanner(System.in);
            seq = sc3.nextInt();//获取用户需要租的车的序号
            //unitMoney[z] = carsForRent[seq[z]-1].getRentmoney();//获得单价,存储在单价数组中
            sum += carsForRent[seq-1].getRentmoney();
        }
        System.out.println("请输入租车天数:");
        Scanner sc4 = new Scanner(System.in);
        int days = sc4.nextInt();
        System.out.println("您租车的总费用是:"+sum*days+"元。");

    }
    else{
        System.out.println("欢迎您下次再来^_^");
    }

}

}